Why does my MacBook air not boot up?

Yesterday my MacBook Air decided not to boot up, what came up was an Apple sign and down the bottom it stared to boot up but within five seconds it shuts down there has not been any water damage but it was dropped about a week ago my only solution was to do command s and I typed in /sbin/fsck -fy and what came up was the volume H D could not be modified properly so I'm not really sure what to do next i'm not actually sure if this is the right thing to do can you help?

I have tried both those options it comes up with disk error and again the Macintosh hd can not be verified properly the lady at the Apple Store said it is probably a hard drive problem but I want to see if anyone had a solution before I take it to the shop?

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